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Follow-up from "protocol: add wl_compositor.error.bad_parent"

The following discussion from wayland!264 (merged) should be addressed:

  • @pq started a discussion: (+1 comment)

    The first commit is good.

    FWIW, Weston's test suite already checks that:

    • test_subsurface_paradox: making a surface into its own child produces BAD_SURFACE
    • test_subsurface_loop_paradox: creating a sub-surface loop with three surfaces produces BAD_SURFACE

The mentioned MR changes the required error code. Weston and its test suite needs to be updated.

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